<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" />
<title>BasicGJChronology xref</title>
<link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" />
</head>
<body>
<div id="overview"><a href="../../../../../apidocs/org/goda/time/chrono/BasicGJChronology.html">View Javadoc</a></div><pre>

<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> *  Copyright 2001-2005 Stephen Colebourne</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> *  Licensed under the Apache License, Version 2.0 (the "License");</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> *  you may not use this file except in compliance with the License.</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> *  You may obtain a copy of the License at</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> *  Unless required by applicable law or agreed to in writing, software</em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> *  distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> *  See the License for the specific language governing permissions and</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> *  limitations under the License.</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.goda.time.chrono;
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> org.goda.time.Chronology;
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> org.goda.time.DateTimeConstants;
<a name="20" href="#20">20</a>  
<a name="21" href="#21">21</a>  <em class="jxr_javadoccomment">/**</em>
<a name="22" href="#22">22</a>  <em class="jxr_javadoccomment"> * Abstract Chronology for implementing chronologies based on Gregorian/Julian formulae.</em>
<a name="23" href="#23">23</a>  <em class="jxr_javadoccomment"> * Most of the utility methods required by subclasses are package-private,</em>
<a name="24" href="#24">24</a>  <em class="jxr_javadoccomment"> * reflecting the intention that they be defined in the same package.</em>
<a name="25" href="#25">25</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="26" href="#26">26</a>  <em class="jxr_javadoccomment"> * BasicGJChronology is thread-safe and immutable, and all subclasses must</em>
<a name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> * be as well.</em>
<a name="28" href="#28">28</a>  <em class="jxr_javadoccomment"> *</em>
<a name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * @author Stephen Colebourne</em>
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> * @author Brian S O'Neill</em>
<a name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * @author Guy Allard</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * @since 1.2, refactored from CommonGJChronology</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> */</em>
<a name="34" href="#34">34</a>  <strong class="jxr_keyword">abstract</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/goda/time/chrono/BasicGJChronology.html">BasicGJChronology</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/goda/time/chrono/BasicChronology.html">BasicChronology</a> {
<a name="35" href="#35">35</a>  
<a name="36" href="#36">36</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Serialization lock */</em>
<a name="37" href="#37">37</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = 538276888268L;
<a name="38" href="#38">38</a>  
<a name="39" href="#39">39</a>      <em class="jxr_comment">// These arrays are NOT public. We trust ourselves not to alter the array.</em>
<a name="40" href="#40">40</a>      <em class="jxr_comment">// They use zero-based array indexes so the that valid range of months is</em>
<a name="41" href="#41">41</a>      <em class="jxr_comment">// automatically checked.</em>
<a name="42" href="#42">42</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong>[] MIN_DAYS_PER_MONTH_ARRAY = {
<a name="43" href="#43">43</a>          31,28,31,30,31,30,31,31,30,31,30,31
<a name="44" href="#44">44</a>      };
<a name="45" href="#45">45</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong>[] MAX_DAYS_PER_MONTH_ARRAY = {
<a name="46" href="#46">46</a>          31,29,31,30,31,30,31,31,30,31,30,31
<a name="47" href="#47">47</a>      };
<a name="48" href="#48">48</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong>[] MIN_TOTAL_MILLIS_BY_MONTH_ARRAY;
<a name="49" href="#49">49</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong>[] MAX_TOTAL_MILLIS_BY_MONTH_ARRAY;
<a name="50" href="#50">50</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> FEB_29 = (31L + 29 - 1) * DateTimeConstants.MILLIS_PER_DAY;
<a name="51" href="#51">51</a>  
<a name="52" href="#52">52</a>      <strong class="jxr_keyword">static</strong> {
<a name="53" href="#53">53</a>          MIN_TOTAL_MILLIS_BY_MONTH_ARRAY = <strong class="jxr_keyword">new</strong> <strong class="jxr_keyword">long</strong>[12];
<a name="54" href="#54">54</a>          MAX_TOTAL_MILLIS_BY_MONTH_ARRAY = <strong class="jxr_keyword">new</strong> <strong class="jxr_keyword">long</strong>[12];
<a name="55" href="#55">55</a>  
<a name="56" href="#56">56</a>          <strong class="jxr_keyword">long</strong> minSum = 0;
<a name="57" href="#57">57</a>          <strong class="jxr_keyword">long</strong> maxSum = 0;
<a name="58" href="#58">58</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; 11; i++) {
<a name="59" href="#59">59</a>              <strong class="jxr_keyword">long</strong> millis = MIN_DAYS_PER_MONTH_ARRAY[i]
<a name="60" href="#60">60</a>                  * (<strong class="jxr_keyword">long</strong>)DateTimeConstants.MILLIS_PER_DAY;
<a name="61" href="#61">61</a>              minSum += millis;
<a name="62" href="#62">62</a>              MIN_TOTAL_MILLIS_BY_MONTH_ARRAY[i + 1] = minSum;
<a name="63" href="#63">63</a>  
<a name="64" href="#64">64</a>              millis = MAX_DAYS_PER_MONTH_ARRAY[i]
<a name="65" href="#65">65</a>                  * (<strong class="jxr_keyword">long</strong>)DateTimeConstants.MILLIS_PER_DAY;
<a name="66" href="#66">66</a>              maxSum += millis;
<a name="67" href="#67">67</a>              MAX_TOTAL_MILLIS_BY_MONTH_ARRAY[i + 1] = maxSum;
<a name="68" href="#68">68</a>          }
<a name="69" href="#69">69</a>      }
<a name="70" href="#70">70</a>  
<a name="71" href="#71">71</a>      <em class="jxr_javadoccomment">/**</em>
<a name="72" href="#72">72</a>  <em class="jxr_javadoccomment">     * Constructor.</em>
<a name="73" href="#73">73</a>  <em class="jxr_javadoccomment">     */</em>
<a name="74" href="#74">74</a>      <a href="../../../../org/goda/time/chrono/BasicGJChronology.html">BasicGJChronology</a>(<a href="../../../../org/goda/time/Chronology.html">Chronology</a> base, Object param, <strong class="jxr_keyword">int</strong> minDaysInFirstWeek) {
<a name="75" href="#75">75</a>          <strong class="jxr_keyword">super</strong>(base, param, minDaysInFirstWeek);
<a name="76" href="#76">76</a>      }
<a name="77" href="#77">77</a>  
<a name="78" href="#78">78</a>      <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="79" href="#79">79</a>      <strong class="jxr_keyword">int</strong> getMonthOfYear(<strong class="jxr_keyword">long</strong> millis, <strong class="jxr_keyword">int</strong> year) {
<a name="80" href="#80">80</a>          <em class="jxr_comment">// Perform a binary search to get the month. To make it go even faster,</em>
<a name="81" href="#81">81</a>          <em class="jxr_comment">// compare using ints instead of longs. The number of milliseconds per</em>
<a name="82" href="#82">82</a>          <em class="jxr_comment">// year exceeds the limit of a 32-bit int's capacity, so divide by</em>
<a name="83" href="#83">83</a>          <em class="jxr_comment">// 1024. No precision is lost (except time of day) since the number of</em>
<a name="84" href="#84">84</a>          <em class="jxr_comment">// milliseconds per day contains 1024 as a factor. After the division,</em>
<a name="85" href="#85">85</a>          <em class="jxr_comment">// the instant isn't measured in milliseconds, but in units of</em>
<a name="86" href="#86">86</a>          <em class="jxr_comment">// (128/125)seconds.</em>
<a name="87" href="#87">87</a>  
<a name="88" href="#88">88</a>          <strong class="jxr_keyword">int</strong> i = (<strong class="jxr_keyword">int</strong>)((millis - getYearMillis(year)) &gt;&gt; 10);
<a name="89" href="#89">89</a>  
<a name="90" href="#90">90</a>          <em class="jxr_comment">// There are 86400000 milliseconds per day, but divided by 1024 is</em>
<a name="91" href="#91">91</a>          <em class="jxr_comment">// 84375. There are 84375 (128/125)seconds per day.</em>
<a name="92" href="#92">92</a>  
<a name="93" href="#93">93</a>          <strong class="jxr_keyword">return</strong>
<a name="94" href="#94">94</a>              (isLeapYear(year))
<a name="95" href="#95">95</a>              ? ((i &lt; 182 * 84375)
<a name="96" href="#96">96</a>                 ? ((i &lt; 91 * 84375)
<a name="97" href="#97">97</a>                    ? ((i &lt; 31 * 84375) ? 1 : (i &lt; 60 * 84375) ? 2 : 3)
<a name="98" href="#98">98</a>                    : ((i &lt; 121 * 84375) ? 4 : (i &lt; 152 * 84375) ? 5 : 6))
<a name="99" href="#99">99</a>                 : ((i &lt; 274 * 84375)
<a name="100" href="#100">100</a>                   ? ((i &lt; 213 * 84375) ? 7 : (i &lt; 244 * 84375) ? 8 : 9)
<a name="101" href="#101">101</a>                   : ((i &lt; 305 * 84375) ? 10 : (i &lt; 335 * 84375) ? 11 : 12)))
<a name="102" href="#102">102</a>             : ((i &lt; 181 * 84375)
<a name="103" href="#103">103</a>                ? ((i &lt; 90 * 84375)
<a name="104" href="#104">104</a>                   ? ((i &lt; 31 * 84375) ? 1 : (i &lt; 59 * 84375) ? 2 : 3)
<a name="105" href="#105">105</a>                   : ((i &lt; 120 * 84375) ? 4 : (i &lt; 151 * 84375) ? 5 : 6))
<a name="106" href="#106">106</a>                : ((i &lt; 273 * 84375)
<a name="107" href="#107">107</a>                   ? ((i &lt; 212 * 84375) ? 7 : (i &lt; 243 * 84375) ? 8 : 9)
<a name="108" href="#108">108</a>                   : ((i &lt; 304 * 84375) ? 10 : (i &lt; 334 * 84375) ? 11 : 12)));
<a name="109" href="#109">109</a>     }
<a name="110" href="#110">110</a> 
<a name="111" href="#111">111</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="112" href="#112">112</a>     <em class="jxr_javadoccomment">/**</em>
<a name="113" href="#113">113</a> <em class="jxr_javadoccomment">     * Gets the number of days in the specified month and year.</em>
<a name="114" href="#114">114</a> <em class="jxr_javadoccomment">     * </em>
<a name="115" href="#115">115</a> <em class="jxr_javadoccomment">     * @param year  the year</em>
<a name="116" href="#116">116</a> <em class="jxr_javadoccomment">     * @param month  the month</em>
<a name="117" href="#117">117</a> <em class="jxr_javadoccomment">     * @return the number of days</em>
<a name="118" href="#118">118</a> <em class="jxr_javadoccomment">     */</em>
<a name="119" href="#119">119</a>     <strong class="jxr_keyword">int</strong> getDaysInYearMonth(<strong class="jxr_keyword">int</strong> year, <strong class="jxr_keyword">int</strong> month) {
<a name="120" href="#120">120</a>         <strong class="jxr_keyword">if</strong> (isLeapYear(year)) {
<a name="121" href="#121">121</a>             <strong class="jxr_keyword">return</strong> MAX_DAYS_PER_MONTH_ARRAY[month - 1];
<a name="122" href="#122">122</a>         } <strong class="jxr_keyword">else</strong> {
<a name="123" href="#123">123</a>             <strong class="jxr_keyword">return</strong> MIN_DAYS_PER_MONTH_ARRAY[month - 1];
<a name="124" href="#124">124</a>         }
<a name="125" href="#125">125</a>     }
<a name="126" href="#126">126</a> 
<a name="127" href="#127">127</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="128" href="#128">128</a>     <strong class="jxr_keyword">int</strong> getDaysInMonthMax(<strong class="jxr_keyword">int</strong> month) {
<a name="129" href="#129">129</a>         <strong class="jxr_keyword">return</strong> MAX_DAYS_PER_MONTH_ARRAY[month - 1];
<a name="130" href="#130">130</a>     }
<a name="131" href="#131">131</a> 
<a name="132" href="#132">132</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="133" href="#133">133</a>     <strong class="jxr_keyword">int</strong> getDaysInMonthMaxForSet(<strong class="jxr_keyword">long</strong> instant, <strong class="jxr_keyword">int</strong> value) {
<a name="134" href="#134">134</a>         <strong class="jxr_keyword">return</strong> (value &gt; 28 ? getDaysInMonthMax(instant) : 28);
<a name="135" href="#135">135</a>     }
<a name="136" href="#136">136</a> 
<a name="137" href="#137">137</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="138" href="#138">138</a>     <strong class="jxr_keyword">long</strong> getTotalMillisByYearMonth(<strong class="jxr_keyword">int</strong> year, <strong class="jxr_keyword">int</strong> month) {
<a name="139" href="#139">139</a>         <strong class="jxr_keyword">if</strong> (isLeapYear(year)) {
<a name="140" href="#140">140</a>             <strong class="jxr_keyword">return</strong> MAX_TOTAL_MILLIS_BY_MONTH_ARRAY[month - 1];
<a name="141" href="#141">141</a>         } <strong class="jxr_keyword">else</strong> {
<a name="142" href="#142">142</a>             <strong class="jxr_keyword">return</strong> MIN_TOTAL_MILLIS_BY_MONTH_ARRAY[month - 1];
<a name="143" href="#143">143</a>         }
<a name="144" href="#144">144</a>     }
<a name="145" href="#145">145</a> 
<a name="146" href="#146">146</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="147" href="#147">147</a>     <strong class="jxr_keyword">long</strong> getYearDifference(<strong class="jxr_keyword">long</strong> minuendInstant, <strong class="jxr_keyword">long</strong> subtrahendInstant) {
<a name="148" href="#148">148</a>         <strong class="jxr_keyword">int</strong> minuendYear = getYear(minuendInstant);
<a name="149" href="#149">149</a>         <strong class="jxr_keyword">int</strong> subtrahendYear = getYear(subtrahendInstant);
<a name="150" href="#150">150</a>     
<a name="151" href="#151">151</a>         <em class="jxr_comment">// Inlined remainder method to avoid duplicate calls to get.</em>
<a name="152" href="#152">152</a>         <strong class="jxr_keyword">long</strong> minuendRem = minuendInstant - getYearMillis(minuendYear);
<a name="153" href="#153">153</a>         <strong class="jxr_keyword">long</strong> subtrahendRem = subtrahendInstant - getYearMillis(subtrahendYear);
<a name="154" href="#154">154</a>     
<a name="155" href="#155">155</a>         <em class="jxr_comment">// Balance leap year differences on remainders.</em>
<a name="156" href="#156">156</a>         <strong class="jxr_keyword">if</strong> (subtrahendRem &gt;= FEB_29) {
<a name="157" href="#157">157</a>             <strong class="jxr_keyword">if</strong> (isLeapYear(subtrahendYear)) {
<a name="158" href="#158">158</a>                 <strong class="jxr_keyword">if</strong> (!isLeapYear(minuendYear)) {
<a name="159" href="#159">159</a>                     subtrahendRem -= DateTimeConstants.MILLIS_PER_DAY;
<a name="160" href="#160">160</a>                 }
<a name="161" href="#161">161</a>             } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (minuendRem &gt;= FEB_29 &amp;&amp; isLeapYear(minuendYear)) {
<a name="162" href="#162">162</a>                 minuendRem -= DateTimeConstants.MILLIS_PER_DAY;
<a name="163" href="#163">163</a>             }
<a name="164" href="#164">164</a>         }
<a name="165" href="#165">165</a>     
<a name="166" href="#166">166</a>         <strong class="jxr_keyword">int</strong> difference = minuendYear - subtrahendYear;
<a name="167" href="#167">167</a>         <strong class="jxr_keyword">if</strong> (minuendRem &lt; subtrahendRem) {
<a name="168" href="#168">168</a>             difference--;
<a name="169" href="#169">169</a>         }
<a name="170" href="#170">170</a>         <strong class="jxr_keyword">return</strong> difference;
<a name="171" href="#171">171</a>     }
<a name="172" href="#172">172</a> 
<a name="173" href="#173">173</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="174" href="#174">174</a>     <strong class="jxr_keyword">long</strong> setYear(<strong class="jxr_keyword">long</strong> instant, <strong class="jxr_keyword">int</strong> year) {
<a name="175" href="#175">175</a>         <strong class="jxr_keyword">int</strong> thisYear = getYear(instant);
<a name="176" href="#176">176</a>         <strong class="jxr_keyword">int</strong> dayOfYear = getDayOfYear(instant, thisYear);
<a name="177" href="#177">177</a>         <strong class="jxr_keyword">int</strong> millisOfDay = getMillisOfDay(instant);
<a name="178" href="#178">178</a> 
<a name="179" href="#179">179</a>         <strong class="jxr_keyword">if</strong> (dayOfYear &gt; (31 + 28)) { <em class="jxr_comment">// after Feb 28</em>
<a name="180" href="#180">180</a>             <strong class="jxr_keyword">if</strong> (isLeapYear(thisYear)) {
<a name="181" href="#181">181</a>                 <em class="jxr_comment">// Current date is Feb 29 or later.</em>
<a name="182" href="#182">182</a>                 <strong class="jxr_keyword">if</strong> (!isLeapYear(year)) {
<a name="183" href="#183">183</a>                     <em class="jxr_comment">// Moving to a non-leap year, Feb 29 does not exist.</em>
<a name="184" href="#184">184</a>                     dayOfYear--;
<a name="185" href="#185">185</a>                 }
<a name="186" href="#186">186</a>             } <strong class="jxr_keyword">else</strong> {
<a name="187" href="#187">187</a>                 <em class="jxr_comment">// Current date is Mar 01 or later.</em>
<a name="188" href="#188">188</a>                 <strong class="jxr_keyword">if</strong> (isLeapYear(year)) {
<a name="189" href="#189">189</a>                     <em class="jxr_comment">// Moving to a leap year, account for Feb 29.</em>
<a name="190" href="#190">190</a>                     dayOfYear++;
<a name="191" href="#191">191</a>                 }
<a name="192" href="#192">192</a>             }
<a name="193" href="#193">193</a>         }
<a name="194" href="#194">194</a> 
<a name="195" href="#195">195</a>         instant = getYearMonthDayMillis(year, 1, dayOfYear);
<a name="196" href="#196">196</a>         instant += millisOfDay;
<a name="197" href="#197">197</a> 
<a name="198" href="#198">198</a>         <strong class="jxr_keyword">return</strong> instant;
<a name="199" href="#199">199</a>     }
<a name="200" href="#200">200</a> 
<a name="201" href="#201">201</a> }
</pre>
<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
</html>

